Code quality, fix bug, added chained methods, added new BDD methods.

[ghost]

fixes #48 .

Code Quality:

• Specify public API now lives inside Specify.php, and private properties and methods inside Specify\SpecifyBoostrap.php for clarity and readability.
• Added validations regarding whether the anonymous function is received as argument, and improved the names of the arguments depending on the called function.

Once and for all:

• Enabled the feature described in the documentation that marks a test as incomplete if the it/should only receives the description text without any anonymous function ( Empty specify() and describe() blocks pass tests #48 ).

Good things, even better:

• Added Fluent Interface support, this allows you to add it's and should's chained to a specify or describe. In this way, this example code:

    $this->describe("user", function() {
        $this->it("should have a name", function() {
            // do some asserts
        });

        $this->it("should not have long name", function() {
            // do more asserts
        });
    });

can now be written like this:

    $this->describe('user')
        ->it('should have a name', function() {
            // do some asserts
        })
        ->shouldNot('have long name', function() {
            // do more asserts
        })
    ;

Specify is smarter:

• Added alias its for it, and added shouldNot as counterpart of should
• Added .phpunit.result.cache file to .gitignore

Getting started:

• As soon as this PR is merged, I will continue to add improvements to the tests and the other files inside the Codeception/Specify folder.
• Some changes may require additional documentation, so improving the docs is one of the goals in sight in future commits.

@DavertMik , @Naktibalda I'll pay attention to your comments.

[Naktibalda]

So many changes, I will try to understand what was changed another day.

[ghost]

they are in fact less than they appear to be.

• Specify.php now has the public functions: specify, describe, it and should.
• Whereas Specify/SpecifyBoostrap.php has the rest of the private functions and attributes from original file.
• The functions specify, describe, it and should now return $this; to allow chained statements, and as I specified,
• If an it or should only receives text now that test is marked as incomplete.
• shouldNot and its were added as aliases.

If you need more help reviewing the changes, please let me know, I'll be as explicit as possible.
I know it takes time but I hope the benefits justify the time spent.

[DavertMik]

Thanks, looks good to me, except naming things 😁
If you want to improve specify I would be glad to give all my support with it. As long as tests pass feel free to improve it.

Btw, please join Codeception Slack channel so we could discuss big changes like this upfront. When you are there - text me privately.

[DavertMik]

Bootstrap maybe?

[DavertMik]

Bootstrap?

[DavertMik]

What about this naming:

SpecifyHooks

Before and After are hooks, we can name it like this